Pulverized fuel burner



vJune 2, 1931. R. c. ROE

PULVERIZED FUEL BURNER Filed Jan. 9, 1928 N i Y Patented June 2, 1931,

Renn, C., maar ENGLEWOOD; NEW

i j'PUnvEmz-@DIFU'EL BURNER p Appncationxmai January'a, 192s. serial No. s459125;

'-Ehisinvention relates to fuel and` more particularly to pulver-ized fuel burners,

andi comprises alll improvements 'over' the prior; art; which. are disclosed inthis appl-i- ,cation @ne objectisto providea quicker andfniore complete combustion of the fuel by secu-ring' more rapidthorough and intimate: mixture ofthe;V combustibleV and the airffor--co'xnbuslo. tion. One advantageous Way of accomplish ing thisistoprojectas'tream of fue-land air;V

mixture, and project, against said-stream, seG- ondary air 1n the form ofV a number of Vseparate streams, each stream of' secondary air Vl0@- ing alternately increased" and decreased in volume, butpreferably :not all the streams 1, acting` in unisonf- The secondaryair streams are preferably lcontrolled in groups in such manner.- asto strike.` the stream` of fuelv and. airl mixture from alternate: directions and With*E variable volume so as to induce rapi'd,"thor,.

ough and intimate niiXt-ure'of fuel and air.4

Thev above and other obj ects `vvhich will hereinafrery appear, are; attained. by 4the new gg; and useful improvements disclosed in this; ap.-

pl'i'cation. Toenableothers skilled: in the art to fully understand the essential characteris-v tics offtheimprovements, drawings illustratA ing one mode of carrying out'the inventionl have beeirariiiexed` aspart of this disclosure.

Eig. l isfaview'lookingffroin the furnaceV toward Vthe face Vof theburnen 2 isa sectional view onthe planeinf,

dicated by line 2-,21 of Figs.- l and, 5.

Fig. 3 is a fragmental sectional view on.

pla-ne indicated byline 33fof Fig. 4,

Fig. 4 is a sectionalview on the plane, indi- Figf6 is a perspective View of an int-ermee'.

diete-fragment of oneA of the'rotarly valves.

Qne ,formi of apparatus, for carrying,"out:l the inventioncoIn-prises a burner-1. having i Walter-coolingV tubes"6 which areL part :of the Water-cooled" Wall" surface `ofi the` boiler.

Tube-face blocksv 7, which may ormay 'notbe( refractory faced, are preferably in intimate clontactfvvithtubes 6. l Thepassag'ef 8 for lcarrying theY mixture ofl 'fueland primary, ,airy

' other, Slide iscentfralof theburner` and'` i which a chain 11,v preferably a Silentzehan, drivesvaeefs 12 Seemed Qnredueedshatexff tensions of valve cylinders`A 13. i

Passage Sfhasa. long, narrow-si enamel-l f'l-glwth Openngil which.openseutbhmughf the botto1nof.re cess 4. Each passage 051111162102;V Shaped Opening-,Oceania by af; valve cylinder 13;A Eachlvalvelcylinder,13g hasa Series. of alternate, ,Openings 2 parallel to each other, and another series, Qf=a1ternate @pennas V3i which are parallel, ,te each-Other but transverse to,Y openings In the,I apparaf.

tusfllutrated,openings are right.- aneles.

to 'openings 3.

, Along eachl side of fase/ries,` s

secondary air openings 16vv to 37;.` when the corresponding ,valve 13- is. turned; tonne posi: tion, its openings 2,1p-rfovide, communication f betveenenepassege 9- alternateseeendary air, openings 1.8, 222,6-, 30,' '34,; ali-daher, turned at right auskennen-ings, prov-isle Communication?between the sameressage-Q auf and; alternatesecondaryairropenings 16,29,

4 24 28, 32,36, Communicationbetween passage 9 and openings, 18,22, 2 6, `2,1),534,A beingfshnt;

Offi Similarly, the Qthervalwel CoM-mls the odd numberedjsecondarfy ai!` openings` 1,7 Y to 87 on` the other side of opening 1,5,

The valve or control cylindersQl-B; arefso,

'- tm'edby means @their eearrelatons that:

Openings 17, 21, 25, 29, 33, .37 @Dione edeemlgl alte-mat@ Openings. 1,8, 22,126,3Q,34.,onth

otherside, are controlled in,v unisoawhilef' u ofunison with.; the opeliingsy1'(4 18,21, 2.2,-,

terna Ve openings 16, 20,251,128, 32, y

i peratonl,

`In operation, the fuel,-A and ture enterspassage .8 and passlterelily 011i,

Y through thevlong narrow opening 15 as an 30, 34 on the other side, when the valves 13.

evenly distributed wide thin stream. Suitable power being lapplied to shaft 10 at a Vsuitable rotative ork reciprocating speed by means of chainr 14 and gears 11, 12, the openings 16 to 37 are controlled as previously eX- plained, so that 4Vthe secondary air which enters'passages 9 leavesopenings 16 to-37 in volume and at times to be now explained more fully. Since as previously explained,

openings 17, 21, 25, 29, 33,37 on one side act in unison with alternate openings18, 22, 26,

start Vto permit passage of. secondary `air out of these openings, this secondary air emerges as la number 'offseparate streamsfrom the' walls of recess 4'and strikesagainst opposite alternate places of the fuel andprimary air mixture stream which emerges straight out fromfthe bottom of recess 4. As the valves 13"`cont inue their movement, the volume ofV y*this secondary air increases to a maximum,

then -f'lecreases to aminimum, then again increases toa maximum, andso on. While this is going on,.the0ther openings 19,23, 27, 31, jfand alternate oppositeopenings 16, 20,24,

' 28'32 ,36,"are actingV similarly butin exactly 'minimum, and conversely.

opposite phase.Vv That is, when the lirstvdescribed 'openings17, 21', 25, 29,33,37, 18, 22,

26,30, 34, are `-at a maximum, openings 19,

23, 27, 31, 35,*16,20, 24, 28, 32, 36,.-` are at a Thisjcycle is repeated indefinitely. t j

lIn consequence ofthi's' action, the secondaryl yairl in the form of separate relatively thin streams, 'strikes the stream of fuel and primary air mixture from opposite, Valternate, shiftable directions, in variable volume, producing a hig-hstate 'of agitation and extremely-quick and thorough mixture of the fuel-and' air.- for combustion.r

The number and size of the secondary airy openings may be varied to provide any dev siredflesserf'or greaternumbenas also may 451 therapidityof 'the changesof direction and volume 'of secondary airf thus allowing change 'of type'of agitation in any `degree desired. 1T-he alter'nategroups of openings in valves '13 may beat -vother angles than right l angles, andthe mechanism maybe so convstructed Ythat thefseco'ndary air streams will alternate without anyappreciable time when both sets of secondary air streams will'be functioning'at'once. y l y 'fl'.llhe invention may beembodied in other specific :`orm s' without departing from: the

. spirit oriv essential characteristics vof the invention,l andthe present embodimentis therel fore to be considered in all respects as illustrative.and'notrestrictive, the scope of the linvention being indicated by the appended' Aclaims rather than by theforegoing description, and all' changeswhich come within the meaning andV range rof Y. equivalencyl fof the comprising, fuel and riand vpower drivableV control mechanism designed to alternately increase and decrease the volume of air from different parts of said secondaryair outlet means. Y

2. The fuel burner of claim 1 in which the secondaryair outlet means comprisesa pluralityofopenings.l 3. The fuel burner of claim 1in which the secondary air outlet means comprises open:-y

ings arranged in a plurality of groups, the openings of any onel group being controlled E1n unison. f j i Y 4. A fuel burner comprising, long fuel:V

and primary air'mixture outlet means, a line of secondary air outlet` openings along each Vsideof the fuel and primar air mixture out- Vlet means, and power driva le control mecha-i1 nism to alternately increase and decrease thevolume of air fromeach opening.

5. The fuel burner lof-:claim 4in .which ings on the other side, and conversely. 6. A fuel burner comprising,`long fuel and primaryair. mixture outlet means, longsecf ondary air outlet means'vclosely adjacent and along the `fuel and primary air mixture 'out-1 let means, and a power drivable rotary valve the lpower drivable control mechanism is designed to alternately increase and decrease thefvol ume of air from certain openings; on one side while alternately decreasing and increasingA the'volume of air fromcorre'sponding openfor the secondary air Outlet means substantially coextensive with the secondary air outlet means.A Y

7.: A fuel 'burner comprising,- long fuel and.

primary air mixture .outlet vmeans,` two long secondary air outletmealns', fone, closelyadjacent and along each side ofv the fuel and primary air mixture outlet"means,'and asep-L arate power drivable rotary valve foreach secondary air outlet means. i

u 8., The methodof mixing a `fuel vand primary air mixture with secondary air which comprises, projecting a'stream of fuel and primary 'air mixture continuously, and pro jecting secondary/,air against the stream of fuel andprimary air mixtureadjacentwhere the. mixture is projected with different parts of said secondary air alternately increasing and decreasing infvolume. 9. The. method ofyclaim 8whichy comprises projecting secondary air as a- `plurality lof streams.V

. 119. Arh@ mahoaf'claim s which-cdiirise'g proj ectlng secondaryv air as f a plurality of streams, certain of said streams being controlled in unison. l

11. The method of claim 8 which comprises projecting secondary air as a plurality of groups of streams, the streams of any one group being controlled in unison, and one group being controlled out of unison with another group.

12. The method of claim 8 which comprises projecting secondary air as streams along each side of the fuel and primar air mixture, certain streams on one side being conf trolled out of unison with corresponding streams on the other side.

13. The method of claim 8 which comprises projecting secondary air as groups of streams along each side of the lfuel and primary air mixture stream, the streams of anyone group being controlled in unison, and one group of streams being controlled out of unison Y With another group on the same side and also out of unison With its corresponding group on the other side. Y Y

141. The method of claim 8 Which comprises projecting the fuel and primary air mixture as a thin Wide stream.

15. The method of claim 8 which comprises Q projecting fuel and primary air mixture as a thin Wide stream, and projecting secondary air as a plurality of streams the Width of each Y of which is relatively great as compared With its thickness.

16. A fuel burner comprising, twoside by side secondary air passage members tapering in the same direction and providing. a limited space between and oppositely tapered to themselves, and a fuel and primary air mixture passage member occupying said tapered space and being tapered in the same direction as the tapered space.

17. A fuel burner having a burner face, long fuel and primary air mixture outlet means in said face, long secondary air outlet means in said face adjacent said mixture outlet means,VpoWer-drivable, long rotary valve mechanism in the burner to alternately increase and decrease the volume of air from different parts of said secondary air outlet means and extending in the same general direction as said face, and fluid-coolable means in the burner and extending in the same general direction as the rotary valve mechanism lo prevent an undue rise of temperature of said valve mechanism.

In testimony whereof I hereunto affix my 

